/*

 * Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description: 

 *   Validate WPA2 only keys

 *

 */

/*

 * %version: 1 %

 */

#include <QString>

#include "wpa2keyvalidator.h"

/*!

    \class Wpa2KeyValidator wpa2keyvalidator.cpp

    \brief Utilities for WPA2 only key validations.

*/

/*!

    \enum Wpa2KeyValidator::KeyStatus

    This enum defines the validation results.

    \var Wpa2KeyValidator::KeyStatusOk

    Key is valid.

    \var Wpa2KeyValidator::KeyStatusIllegalCharacters

    Key contains illegal characters.

    \var Wpa2KeyValidator::KeyStatusWpa2TooShort

    WPA key is too short. Minimum allowed length is 8. See 

    WlanWizardUtils::validateWpaKey().

    \var Wpa2KeyValidator::KeyStatusWpa2TooLong

    WPA key is too long. Minimum allowed length is 64 for hex key and 63 for 

    ascii key. See WlanWizardUtils::validateWpaKey().

*/

/*! 

 * Process WPA2 key validation. A passphrase can contain from 8 to 63 ASCII

 * characters where each character MUST have a decimal encoding in the range of

 * 32 to 126, inclusive.

 *

 * A preshared key is stored as 64 character hex string.

 * 

 * @param key PSK to be validated

 * 

 * @return Following values are possible

 * - KeyStatusOk

 * - KeyStatusIllegalCharacters

 * - KeyStatusWpa2TooShort

 * - KeyStatusWpa2TooLong

 */

Wpa2KeyValidator::KeyStatus Wpa2KeyValidator::validateWpa2Key(const QString &key)

{

    int length = key.length();

    KeyStatus ret = KeyStatusOk;

    if (length < Wpa2MinLenght) {

        ret = KeyStatusWpa2TooShort;

    }

    else if (length > Wpa2MaxLenght) {

        ret = KeyStatusWpa2TooLong;

    }

    // hex string

    else if (length == Wpa2MaxLenght) {

        ret = isHex(key);

    }

    else {

        ret = isAscii(key);

    }

    return ret;

}

/*!

 * Process Ascii validation. Allowed characters are from 32 to 126.

 * 

 * @param key to be validated.

 * 

 * @return Following values are possible

 * - KeyStatusOk

 * - KeyStatusIllegalCharacters

 */

Wpa2KeyValidator::KeyStatus Wpa2KeyValidator::isAscii(const QString &key)

{

    QChar ch32(32);

    QChar ch126(126);

    const QChar *data = key.data();

    while (!data->isNull()) {

        if ((*data) < ch32 || (*data) > ch126) {

            return KeyStatusIllegalCharacters;

        }

        ++data;

    }

    return KeyStatusOk;

}

/*!

 * Process Hex validation. Allowed characters are

 * - from 0 to 9

 * - from a to f

 * - from A to F

 * 

 * @param key to be validated.

 * 

 * @return Following values are possible

 * - KeyStatusOk

 * - KeyStatusIllegalCharacters

 */

Wpa2KeyValidator::KeyStatus Wpa2KeyValidator::isHex(const QString &key)

{

    QChar ch_A(65); // Character: A

    QChar ch_F(70); // Character: F

    QChar ch_a(97); // Character: a

    QChar ch_f(102);// Character: f

    const QChar *data = key.data();

    while (!data->isNull()) {

        if (data->isDigit() ||

            (*data) >= ch_a && (*data) <= ch_f ||

            (*data) >= ch_A && (*data) <= ch_F) {

            ++data;

        }

        else {

            return KeyStatusIllegalCharacters;

        }

    }

    return KeyStatusOk;

}